Khan Academy

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Salman Khan started out making a few algebra videos for his cousins.  He has an amazing gift for breaking down complex problems into easy-to-understand modules.  Once he began putting his videos on YouTube they became extremely popular.  There are now more than 2,100 videos and 100 self-paced exercises and assessments covering  everything from arithmetic to physics, finance to history. Salman Khan’s TED Talk video is well worth watching.